Hmm. I think it runs on a 24 hour time period. So it's 3 per day but not necessarily 3 monday, 3 Tuesday, 3 weds. Etc. Maybe you gave 2 like 20 hours ago, then gave one successfully, then tried again but it considered that 4 within 24 hours. Maybe? Sorry it didn't work. Thanks for letting me know. Do you think that might be they case? !LUV